I have a Photosmart c7280 connected to my home network via cable directly to router. I turned off the printer and unplugged for a few days to paint the room. When I reconnected it I got the message "Unknown Device - Disconnect Device, refer to printer documentation for troubleshooting". No devices are connected to the printer and there has never been any connected other than the network cable. I am at a loss as to what the problem can be. For the first time Google has failed me and I can finde no solutions anywhere. If anyone has any suggestions please help. Thank you.
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